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51B293-2 — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

51B293-2: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 430FSE OR STEEL COMP 81B45 OR STEEL COMP 4140 OR STEEL COMP 302B OVERALL, head_style: FLAT COUNTERSUNK, grip_length: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN, head_diameter: 0.375 INCHES MINIMUM AND 0.387 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-105-8672, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
51B293-2
NSN: 5305-00-105-8672
FSC: 5305 — Screws
CAGE: 0JRC1 — NORTHROP GRUMMAN TECHNICAL SERVICES, INC. DBA DEFENSE SYSTEMS SECTOR (USA)
SPECIFICATIONS
materialSTEEL COMP 430FSE OR STEEL COMP 81B45 OR STEEL COMP 4140 OR STEEL COMP 302B OVERALL
head_styleFLAT COUNTERSUNK
grip_length0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN
head_diameter0.375 INCHES MINIMUM AND 0.387 INCHES MAXIMUM IN
thread_length0.219 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES GRIP
fastener_length0.385 INCHES MINIMUM AND 0.432 INCHES MAXIMUM IN
special_featuresALUMINUM GROMMET 0.012 IN. THK ON BEARING SURFACE OF HEAD IN
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
NSN5305-00-105-8672
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 51B293-2 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SURFACE FINISH: 32.0 MICROINCHES GRIP
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FASTENER LENGTH: 0.385 INCHES MINIMUM AND 0.432 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
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THREAD LENGTH: 0.219 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
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NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
•
GRIP LENGTH: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES GRIP
FASTENER LENGTH0.385 INCHES MINIMUM AND 0.432 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.219 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
GRIP DIAMETER0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN
SPECIAL FEATURESALUMINUM GROMMET 0.012 IN. THK ON BEARING SURFACE OF HEAD IN
SUBSTITUTES & CROSS-REFERENCES 1
150001-2Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 51B293-2?
51B293-2 is a SCREW,CLOSE TOLERANCE.
What parts can replace 51B293-2?
There is 1 known substitute for 51B293-2: 150001-2. Substitute compatibility should be verified for your specific system.
What is the NSN for 51B293-2?
51B293-2 is cataloged in the U.S. Government catalog under NSN 5305-00-105-8672. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.